Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 686 · 40 questions

The fast method (One-step multiplier): Increase by p%: multiply by (100 + p)% — up 20% is × 1.2. Decrease by p%: multiply by (100 − p)% — down 25% is × 0.75. Easy way to multiply: × the whole number (115 or 75), then ÷ 100.

1. 1.140 decreased by 15% =
2. 2.412 increased by 50% =
3. 3.564 decreased by 75% =
4. 4.425 decreased by 8% =
5. 5.564 increased by 75% =
6. 6.775 decreased by 8% =
7. 7.725 increased by 8% =
8. 8.265 increased by 60% =
9. 9.228 increased by 75% =
10. 10.200 decreased by 15% =
11. 11.390 decreased by 30% =
12. 12.740 increased by 75% =
13. 13.185 decreased by 20% =
14. 14.740 decreased by 30% =
15. 15.40 increased by 30% =
16. 16.800 decreased by 8% =
17. 17.280 decreased by 40% =
18. 18.215 decreased by 40% =
19. 19.76 decreased by 25% =
20. 20.780 decreased by 40% =
21. 21.276 decreased by 25% =
22. 22.525 decreased by 12% =
23. 23.800 increased by 10% =
24. 24.465 increased by 40% =
25. 25.435 decreased by 40% =
26. 26.160 increased by 5% =
27. 27.160 decreased by 75% =
28. 28.220 increased by 25% =
29. 29.540 increased by 30% =
30. 30.280 decreased by 5% =
31. 31.600 increased by 35% =
32. 32.740 increased by 25% =
33. 33.460 increased by 15% =
34. 34.40 decreased by 30% =
35. 35.540 decreased by 10% =
36. 36.680 decreased by 15% =
37. 37.106 decreased by 50% =
38. 38.248 increased by 25% =
39. 39.420 decreased by 20% =
40. 40.164 decreased by 50% =

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